Image forming apparatus

An image forming apparatus comprising:

• an image carrying member in which a photosensitive layer is formed on a surface;
• a charging device that charges the surface of the image carrying member;
• an exposure device that exposes the surface of the image carrying member charged by the charging device to form an electrostatic latent image on the surface of the image carrying member;
• a development device that develops the electrostatic latent image formed on the surface of the image carrying member into a toner image;
• an intermediate transfer belt to which the toner image formed on the image carrying member is primarily transferred;
• a primary transfer roller that is pressed against the image carrying member via the intermediate transfer belt;
• and
• a secondary transfer roller that secondarily transfers the toner image primarily transferred to the intermediate transfer belt onto a recording medium,
• wherein the intermediate transfer belt is a hard resin belt,
• the development device includes:
• a development container that contains a two-component developer including a magnetic carrier and a toner;
• and
• a developer carrying member that is rotatably supported by the development container and carries the developer on an outer circumferential surface,
• the developer carrying member includes:
• a development sleeve which carries the developer, in which a magnetic brush is formed on a surface and which is rotatable;
• and
• a magnet in which a plurality of magnetic poles that are fixed in the development sleeve so as not to rotate and include a main pole disposed in a development region opposite the image carrying member relative to a direction of rotation of the development sleeve are spaced at predetermined intervals in a circumferential direction and
• when a horizontal magnetic force gradient in a position where a horizontal magnetic force of the main pole is 0 [mT] is A, |A|≥3.74 is satisfied.